> For the complete documentation index, see [llms.txt](https://geniesys.gitbook.io/geniesys/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://geniesys.gitbook.io/geniesys/for-administrators/how-to-create-a-plugin.md).

# How to create a plugin?

GenIE-Sys plugin can start as a simple file with a PHP function. All plugins are being installed in `/geniesys/plugins`. The only requirement for a plugin is that the folder name has to be the same as the menu name and `index.php` file should be available inside the plugin folder to initialize the plugin.

```
/geniesys/plugins/{pluginname}/index.php
/geniesys/plugins/{pluginname}/tool.php
```

**Hello World! Plugin**

```
/geniesys/plugins/hello/tool.php
```

1. Creat hello directory inside the plugin directory
2. Place following index.php file inside hello directory

```
<?php
//index.php
$subdir_arr = explode("/", $_SERVER['REDIRECT_URL']);
$mennu_arr = explode("<br />", $c['menu']);
$menu_exist = false;
for ($search_num = 0; $search_num < count($mennu_arr); $search_num++) {  
    if (trim(strtolower($mennu_arr[$search_num])) == strtolower($subdir_arr[count($subdir_arr) - 1]) ||      
    trim(strtolower($mennu_arr[$search_num])) == "-".strtolower($subdir_arr[count($subdir_arr) - 1])) {  
        $menu_exist = true;
    }
}
if(strtolower(basename(dirname(__FILE__)))== strtolower($subdir_arr[count($subdir_arr)-1]) && $menu_exist==true){
    $c['initialize_tool_plugin'] = true;
    $c['tool_plugin'] = strtolower($subdir_arr[count($subdir_arr) - 1]);
}
?>
```

3.) Add tool.php into the hello\_world directory. `tool.php` file will be used to write all the function related to the plugin.

```
<?php
//tool.php
echo "Hello World!";
?>
```

4.) Log into the system and add hello into the menu like shown in following figure.

![GenIE-Sys login screen](https://234156639-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MJh8mKRNRBZEkZeCU0R%2F-MJjI2-xcOggG7EwHXvi%2F-MJjQpJ2LuRsm3vNv2xZ%2Flogin_screen.png?alt=media\&token=8b9fb488-ff0e-4e03-b12c-62f70656be35)

5.) Navigate to `http://[server name]/geniesys/hello`

![landing page of the plugin](https://234156639-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MJh8mKRNRBZEkZeCU0R%2F-MJjI2-xcOggG7EwHXvi%2F-MJjQxrZiXnyN7JEpIip%2Fhello_world.png?alt=media\&token=94c68de2-42d6-439a-9738-e7f56d6e6265)

More details about the GenIE-Sys API is available on <https://api.plantgenie.org>